Processing and Dielectric Properties of Nanocomposite Thin Film “Supercapacitors” for High-Frequency Embedded Decoupling

Raj, P. Markondeya; Govind, V.; Abothu, I.R.; Wan, Lixi; Gerhardt, Rosario A.; Swaminathan, Madhavan; Tummala, Rao

doi:10.1109/tcapt.2007.901736

Cited by 21 publications

(12 citation statements)

References 17 publications

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“…56,57 As conductive ller content approaches the percolation threshold, the thickness of nanodielectric decreases, thus the applied electric eld within nanodielectric increases, leading to enhanced electronic polarization. 56,57 As conductive ller content approaches the percolation threshold, the thickness of nanodielectric decreases, thus the applied electric eld within nanodielectric increases, leading to enhanced electronic polarization.…”

Section: Emi Shielding Of Agnw/ps Versus Mwcnt/ps Nanocompositesmentioning

confidence: 99%

Outstanding electromagnetic interference shielding of silver nanowires: comparison with carbon nanotubes

Arjmand

Moud

et al. 2015

RSC Adv.

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Silver nanowires (AgNWs) were synthesized by AC electrodeposition of Ag into porous aluminum oxide templates. AgNWs were embedded into polystyrene via a solution processing technique to create a nanocomposite. For comparison, carbon nanotube (CNT)/polystyrene nanocomposites were identically generated. TEM and XRD analyses confirmed the synthesis of AgNWs with an average diameter and length of 25 nm and 3.2 mm, respectively. TEM images also revealed that at the molding temperature (240 C) AgNWs transformed into a chain of nanospheres. At low filler loadings, the AgNW/polystyrene nanocomposites presented inferior electrical properties compared to the CNT/polystyrene nanocomposites. This was attributed to a lower aspect ratio, fragmentation phenomenon and poorer conductive network for AgNWs. However, at high filler loadings, the electrical properties of the AgNW/polystyrene nanocomposites significantly increased. It seems that at high filler loadings, the conductive network was well-established for both types of nanocomposites and thus, the higher innate conductivity of AgNWs played a dominant role in presenting superior electrical properties. Fig. 5 EMI SE (overall, reflection and absorption) of AgNW/PS and MWCNT/PS nanocomposites as a function of nanofiller loading.Fig. 6 (a) Imaginary permittivity, and (b) real permittivity as a function of nanofiller loading. 56596 | RSC Adv., 2015, 5, 56590-56598 This journal is

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Section: Emi Shielding Of Agnw/ps Versus Mwcnt/ps Nanocompositesmentioning

confidence: 99%

Outstanding electromagnetic interference shielding of silver nanowires: comparison with carbon nanotubes

Arjmand

Moud

et al. 2015

RSC Adv.

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“…In other words, high‐frequency circuit boards are ubiquitous in daily communication products. Within the next few years, it is certain that developments of high‐frequency circuit boards will continue apace and that huge demands will arise in the market 13–19. Therefore, in this study, we investigated the dielectric properties of LCPi/SiO 2 nanocomposites within the high frequency range from 1 MHz to 3 GHz to observe changes in their dielectric properties.…”

Section: Introductionmentioning

confidence: 99%

High‐frequency dielectric characterization for liquid crystalline polyimide/SiO₂ nanocomposites

Chang

Lee

2010

J of Applied Polymer Sci

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In this study, we investigated the influence of frequency, film thickness, and SiO 2 content on the dielectric constant (K) and loss tangent (tan d) of liquid crystalline polyimide (LCPi) and liquid crystalline polyimide/SiO 2 (LCPi/SiO 2 ) nanocomposites in a high frequency environment. We tested the loss tangent of the LCPi and LCPi/SiO 2 nanocomposites within the high frequency 1 MHz to 3 GHz range, and determined its value to be between 0.01 and 0.001. In addition, we found a formant for frequencies ranging from 0.5 GHz to 1 GHz. We also inferred from the dielectric loss graphs of films with different thicknesses that the formants of the loss tangent shifted toward higher frequencies with increasing thicknesses. When measuring the dielectric constant at high frequencies, we found that the dielectric constant decreased markedly with increased SiO 2 contents. Using the dielectric constant of high-frequency circuit board materials as the standard, the dielectric constant of the LCPi/SiO 2 nanocomposites at the frequency range from 1 MHz to 3 GHz was found to be as high as 2.2-3.4, thereby confirming the viability of LCPi/ SiO 2 nanocomposites as candidate materials for high-frequency circuit board. In addition, the volume resistivity (q V ) of the LCPi and LCPi/SiO 2 nanocomposites also increased with increased SiO 2 contents.

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“…BT shows a large dielectric relaxation at microwave frequencies whose origin is linked to its domain structure. The dielectric relaxation frequency depends on the ferroelectric domain size and typically lies in the range 100 MHz to 10 GHz [9]. A relaxation frequency near 1 GHz has 15 been experimentally demonstrated for BT with different domain sizes, where for instance the dielectric constant for samples with micrometer sized domains dropped from 1900 at 10 kHz to 280 at 5.6 GHz [1].…”

Section: Introductionmentioning

confidence: 99%

Preparation, microstructure and microwave dielectric properties of sprayed PFA/barium titanate composite films

Qin

Dancer

Grovenor

et al. 2016

Composites Science and Technology

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Frequency dependence of the dielectric properties of polymer-ferroelectric composites at different bands of microwave frequencies was investigated in this work.Perfluoroalkoxy (PFA) / barium titanate (BaTiO 3 ) nanocomposite films were prepared by spray deposition. The spraying process was scaled up to fabricate large area (max. 160 mm x 160 mm) uniform composite sheets out of which a controlled bonding process was introduced to form composite blocks.The microstructure of the composite films was examined by SEM with a microtome sample preparation method to evaluate the effectiveness of the spraying process at producing uniform particle distributions. The dielectric properties of the composite films with various BaTiO 3 loadings were characterised by an Impedance Analyzer at frequencies between 10 Hz and 1 MHz and Vector Network Analyzer at 12 -18 GHz respectively. The Lichtenecker mixing rule was incorporated to fit the measured dielectric constant data, which gives estimates of dielectric constant of the BaTiO 3 nanometer sized particles to be 895 and 571 at 10 kHz and 15 GHz respectively. In comparison, the composite effective dielectric constant was approximately reduced by 25% at 10 kHz than that at 15 GHz.

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Processing and Dielectric Properties of Nanocomposite Thin Film “Supercapacitors” for High-Frequency Embedded Decoupling

Cited by 21 publications

References 17 publications

Outstanding electromagnetic interference shielding of silver nanowires: comparison with carbon nanotubes

Outstanding electromagnetic interference shielding of silver nanowires: comparison with carbon nanotubes

High‐frequency dielectric characterization for liquid crystalline polyimide/SiO₂ nanocomposites

Preparation, microstructure and microwave dielectric properties of sprayed PFA/barium titanate composite films

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Processing and Dielectric Properties of Nanocomposite Thin Film “Supercapacitors” for High-Frequency Embedded Decoupling

Cited by 21 publications

References 17 publications

Outstanding electromagnetic interference shielding of silver nanowires: comparison with carbon nanotubes

Outstanding electromagnetic interference shielding of silver nanowires: comparison with carbon nanotubes

High‐frequency dielectric characterization for liquid crystalline polyimide/SiO2 nanocomposites

Preparation, microstructure and microwave dielectric properties of sprayed PFA/barium titanate composite films

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High‐frequency dielectric characterization for liquid crystalline polyimide/SiO₂ nanocomposites